This is the sound generator that helps muffle the constant ringing or buzzing of tinnitus so users can concentrate or sleep. Widely recommended by audiologists around the world, the device’s 24 tracks include doctor-developed melodies, nature sounds, such as the ocean and rain, and various white-noise frequencies (1,000-10,000 Hz) so you can choose the track that best helps mask your tinnitus. The digital recordings play continuously without the jarring silences that separate MP3s to aid concentration at work or promote restful sleep at night. The portable device sets up on a desktop or nightstand and includes a headphone jack, a backlit alarm clock, and an upgradable sound card system for adding optional sound cards with different audio themes. Powered by the included AC adapter or four AA batteries (not included). 5 1/2" H x 4 1/2" W x 3 1/2" D. (15 oz.)